Figure 5. L = length, D = greatest diameter. 1. Amphicoryna scalaris (Batsch), L 600 µm. 2. Dentalina subarcuata (Montagu), L 1.9 mm. 3-4. Fissurina marginata (Montagu), L 165, L 145 µm. 5-6. Fissurina orbignyana Seguenza, L 600 µm. 7. Lagena substriata Williamson, L 600 µm. 8-9. Laryngosigma lactea (Walker and Jacob), L 210, L 450 µm. 10. Oolina williamsoni (Alcock), L 500 µm. 11. Procerolagena clavata (d’Orbigny), L 600 µm. 12-13. Robertina subcylindrica (Brady), L 370, L 325 µm. 14-16. Ammonia falsobeccarii (Rouvillois), D 400, L 340, D 430 µm. 17. Bolivina pseudoplicata Heron-Allen and Earland, L 240 µm. (To see enlargement, click on image.)